Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000apj...540..572w&link_type=abstract
The Astrophysical Journal, Volume 540, Issue 1, pp. 572-582.
Astronomy and Astrophysics
Astronomy
5
Sun: Radio Radiation, Waves
Scientific paper
This paper describes a new scenario for type III solar radio emission. While the conventional theories emphasize Langmuir waves propagating along the ambient magnetic field, the present model stresses extraordinary-mode Bernstein waves with quasi-perpendicular wave vectors. The present model relies on plasma inhomogeneity and wave reflection to produce the electromagnetic radiation, in contrast to the conventional theories, which rely on nonlinear wave-wave and wave-particle interactions. The essence of the model is that Bernstein waves with frequencies above the X-mode cutoff frequency are first excited. Initially these waves can only propagate toward regions with higher density and magnetic field. During this process, quasi-electrostatic Bernstein waves spontaneously convert to electromagnetic waves and rapidly reach the local X-mode cutoff frequency. Subsequently, these waves are reflected and propagate away from the source region. The escaping radiation is observed as the type III emission. It is pointed out that in general, the observed radiation should possess one band in the dynamic spectrum. However, under certain conditions, the present theory is also capable of explaining the appearance of a pair of bands similar to those commonly called the ``fundamental'' and ``harmonic'' components in the literature. The present model resolves some of the inconsistencies between the usual plasma emission hypothesis and the observed pair emissions.
Li Yadong
Wu Shang-Chen
Yoon Peter H.
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